<head>
    hello
<script type="text/javascript">
function getQueryVariable(variable)
{
       var query = window.location.search.substring(1);
    console.log("query="+query)
       var vars = query.split("&");
       for (var i=0;i<vars.length;i++) {
               var pair = vars[i].split("=");
               if(pair[0] == variable){return pair[1];}
       }
       return(false);
}

var roomId= getQueryVariable("roomId");
var deeplinkUrl = "hap://app/com.leonard.wedraw?roomId="+roomId;
console.log("deeplinkUrl="+deeplinkUrl);
window.location = deeplinkUrl;
</script>
<head>